the size of vfprintf in libc symbol table is so big, why?

2
votes

$ readelf -s /lib/i386-linux-gnu/libc-2.13.so

below is a line from the cmd ouput

Num: Value Size Type Bind Vis Ndx Name

2261: 00040130 20136 FUNC GLOBAL DEFAULT 12 vfprintf@@GLIBC_2.0

Could some nice buddy tell me why the size of vfprintf is so big? thanks.

1
symbolsglibcelf

1 Answers

1
votes

Because vfprintf is where the real work is done. printf, fprintf and vprintf just wrap around it.

sprintf, snprintf, vsprintf and vsnprintf create a string stream and pass it to vfprintf.